Sarah Shourd, the American hiker freed from Iranian captivity after more than a year, spoke today on American soil publicly for the first time, thanking those who helped and calling for a similar release for her fiance and friend who remain in captivity.

"This is not the time to celebrate," Shourd told reporters from New York City. "My disappointment at not sharing this with [fiance Shane Bauer and friend Josh Fattal] was crushing. And I stand before you today only one-third free.

"I walked out of prison with my spirit bruised but unbroken and I am more determined than ever that Shane and Josh, God willing, insha-Alla, will soon walk out the same way," Shourd said.

Shourd, Bauer and Fattal, were arrested while hiking in July 2009 for allegedly crossing into Iran from Iraq. For the last 14 months, the three had been held in Tehran, Iran's Evin prison under accusations of espionage.

"We committed no crime and we are not spies," Shourd said. "We in no way intended any harm to the Iranian government or its people and believe a huge misunderstanding led to our detention and prolonged imprisonment."

Shourd was released Tuesday with a guarantee of $500,000 bail, in part due to concerns over what her lawyer called her deteriorating medical condition. She reportedly suffers from a serious gynecological condition and found a possibly cancerous lump in her breast.

Doctors in Oman, where Shourd stopped over before returning to the United States, checked her out and declared her "physically well," Shourd said.

Now that she is back, Shourd said she will turn all her attention to gaining freedom for the remaining hikers.

"My work is cut out for me and I need all the help I can get," Shourd said. "I ask anyone that cares about Shane and Josh's freedom to stand behind us now."

"Josh and Shane are still detained in Iran, as you well know," Laura Fattal said of her son Josh Fattal and his friend, Shane Bauer, directly addressing Ahmadinejad. "We thank you for bringing Sarah home, but now it is time [to] bring Josh and Shane home. We urge you ... to show the same compassion you had for Sarah to bring Josh and Shane home."

"I was very happy for Sarah and her mom," Cindy Hicky, Bauer's mother, said. "But very sad that Shane wouldn't be coming with her. ... How hard it must have been for them to separate."

Shourd's arrival in New York coincided with that of Ahmadinejad, who will be in New York to attend the U.N. General Assembly.

"We hope they appreciate this job," Ahmadinejad said in a state TV interview broadcast Friday night, in regards to Shourd's release.

"It would not be misplaced to ask that the U.S. government should take a humanitarian gesture to release the Iranians who were illegally arrested and detained here in the United States," Ahmadinejad said.

Shourd Thanks Ahmadinejad

"I want to really offer my thanks to everyone in the world, all of the governments, all of the people that have been involved," said Shourd, 32. "And I especially, particularly want to address President Ahmadinejad, and all of the Iranian officials ... and the religious leaders, and thank them for this humanitarian gesture.

"I'm grateful, and I'm very humbled by this moment," she said.

Family of Jailed Hikers Speak Out

The families of all three hikers released a statement Thursday, saying they "applaud the Iranian authorities for showing compassion in Sarah's case and again call on them to do the only right thing and release Shane and Josh immediately."

Laura Fattal, the mother of Josh Fattal, said that her only mission is to bring the two remaining hikers home.

"We believe in our hearts they [Iran] will have this compassion to release both kids and we hope as soon as possible."

Tehran's prosecutor offered little hope for the two jailed hikers, saying Thursday they will now be tried for spying.

President Obama Joins Call for Iran to Release Two More Hikers

President Obama said Tuesday he was "very pleased" by Shourd's release, and called for the release of the other two hikers in a statement, saying they "have committed no crime."

"We remain hopeful that Iran will demonstrate renewed compassion by ensuring the return of Shane, Josh and all the other missing or detained Americans in Iran," Obama said.

The State Department said that the willingness to release Shourd proved Iran's ability to "resolve" all the hikers' cases.

Iranian officials, including Ahmadinejad, had announced last week that Shourd would be released on Sept. 11.

Officials in Iran's judiciary canceled Shourd's release last Friday, but reversed themselves on the condition that her family post $500,000 bail, according to an Iranian prosecutor who spoke to Iran's IRNA news agency.

A "bank guarantee" for the bail had been given, an attorney for the hiker's Masoud Shafie, told ABC News.

"The case inspector informed the Tehran prosecutor of a bank guarantee concerning the posting of bail and after the prosecutor's agreement, he issued the order for her freedom," the prosecutor's website said Tuesday, according to PressTV Iran.

The report did not say who was responsible for the guarantee, but two U.S. officials told ABC News Iran had received "assurances" from the country of Oman concerning the bail money.

A senior U.S. official familiar with the negotiations told ABC News Monday that the U.S. government would not be contributing any cash for Shourd's release.